Not Able to Build the App (ApiTest)

When I try to build the app there is below error in Android Studio:-

Error:Execution failed for task ':Test:ApiTest:compileDebugNdk'.
> Error: Your project contains C++ files but it is not using a supported native build system.
Consider using CMake or ndk-build integration with the stable Android Gradle plugin:
https://developer.android.com/studio/projects/add-native-code.html
or use the experimental plugin:
https://developer.android.com/studio/build/experimental-plugin.html.

I need to link either CMake or Android.mk file ....But there is no such file in your project tree.

Could you please let me know how to build the project and run it? I want to use plugin feature in my project and it is very urgent.